Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '987b08ae9497ce537034454d1e8e22753bc907c2a67ab45200217717b6afbf78' 
  AND token = 'wC6sX5RiStI21pEJbv7rrJ89tzpFt128OfoVKHOP45g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00771

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}